Based on the Patil's story in Chapter 13, what does Sainath truly require from his devotees, and how is this exemplified?

According to the narrative in Chapter 13, Sainath's requirements from his devotees are simple yet profound: 'Two hands, one head, stability, faith, and total surrender. Sainath needs nothing else; only that one gratitude should be there.' The Patil's story is a perfect illustration of this principle. After his miraculous cure, his response was not merely relief, but an overwhelming sense of gratitude that led to his total surrender at Sai's feet. He exemplified this devotion further by instituting the 'Satya-Sai vow,' a continuous act of faith and remembrance. His actions show that the ultimate offering is not material, but a heart full of unwavering faith and thankfulness.